Audio Joiner

 

Merge audio files into one

Files are joined in the order they appear in the list. Add at least two to begin.

The output is a WAV file, which keeps the join simple and lossless. WAV files are larger than MP3 - if you need a smaller file, convert the joined WAV afterwards. Everything happens in your browser; your audio is never uploaded.

This free Audio Joiner merges two or more audio files into a single file, end to end, in the order you choose. Add your MP3, WAV, M4A or OGG files, arrange them by adding them in the order you want (remove any with its Remove button), and click Join. The tool decodes every file with the Web Audio API built into your browser, stitches them together sample by sample, and gives you one downloadable file with the combined running time shown. Typical uses: joining interview parts, combining song clips, gluing podcast segments, or merging voice notes into one recording.

The download is a WAV file, and that choice is deliberate: WAV is uncompressed, so the join is lossless and needs no encoder library - every segment sounds exactly as it did in the original. The trade-off is size, since WAV runs to roughly 10 MB per minute for stereo audio; if you need a small MP3 for sharing, convert the joined WAV with any audio converter afterwards. Files with different sample rates are handled automatically because the browser decodes everything to a common rate. Nothing is uploaded: your recordings are decoded and joined on your own device, so private audio stays private.

How to use

  1. Click the file picker and choose two or more audio files.
  2. Check the list - files join in the order shown; use Remove to drop a file, then re-add it at the end if you need a different order.
  3. Click "Join audio into one WAV".
  4. Wait while the files decode and join (long recordings take a few seconds).
  5. Read the combined duration, then click the download link to save joined-audio.wav.

Frequently asked questions

Which audio formats can I join?

Any format your browser can play - in practice MP3, WAV, M4A/AAC and OGG cover almost everything; FLAC works in most desktop browsers too. All inputs are decoded to raw audio before joining, so the files do not need to share a format or sample rate. The output is always WAV, because it is lossless and needs no encoder.

Why is the joined file so much bigger than my MP3s?

Because WAV is uncompressed audio - about 10 MB per minute in stereo - while MP3 throws away roughly 90% of the data. The WAV is the full-quality master. If the size is a problem for emailing or uploading, run the joined WAV through any MP3 converter afterwards; you lose nothing important by converting after the join instead of before it.

Can I join video files or extract audio from video?

No - this tool joins audio files only, and it does not process video. If your sound lives in a video file, extract the audio first with an audio-extraction tool, then bring the audio files here to join them.

Is my audio uploaded to a server?

No. Decoding, joining and the download all happen inside your browser using the Web Audio API. Your recordings never leave your device, which makes the tool safe for interviews, voice notes and anything else you would not want on someone else's server.

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